Characterization and optimization of a tapered amplifier by its spectra through a long multi-pass rubidium absorption cell

Zhou, Chao; Barthwal, Sachin; Zhang, Wendong; He, Chuan; Zhou, Lin; Wang, Jin; Zhan, Min

doi:10.1364/ao.57.007427

Cited by 4 publications

(3 citation statements)

References 19 publications

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“…Indeed, backgroundinduced light shifts at the Hz level (10 −15 fraction of the clock frequency) or much higher are easily possible. There have been various attempts to mitigate ASE effects through amplifier optimization [23,24], spatial filtering with optical fibers [25,26], or spectral filtering using volume Bragg gratings [15,21], Fabry-Perot etalons [27], or absorption cells [28]. For an additional review of the origins and consequences of ASE, as well as an in-depth investigation of several strategies for ASE characterization, see [23].…”

Section: Introductionmentioning

confidence: 99%

“…There have been various attempts to mitigate ASE effects through amplifier optimization [23,24], spatial filtering with optical fibers [25,26], or spectral filtering using volume Bragg gratings [15,21], Fabry-Perot etalons [27], or absorption cells [28]. For an additional review of the origins and consequences of ASE, as well as an in-depth investigation of several strategies for ASE characterization, see [23]. Despite these efforts, the risk of lingering Stark shifts is often sufficiently great that current best practice is to employ filtered titanium:sapphire (Ti:S) lasers for the optical trap, benefiting from the significantly weaker spectral background.…”

Section: Introductionmentioning

confidence: 99%

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Characterization and suppression of background light shifts in an optical lattice clock

Fasano

Chen

McGrew

et al. 2021

Preprint

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Experiments involving optical traps often require careful control of the ac Stark shifts induced by strong confining light fields. By carefully balancing light shifts between two atomic states of interest, optical traps at the magic wavelength have been especially effective at suppressing deleterious effects stemming from such shifts. Highlighting the power of this technique, optical clocks today exploit Lamb-Dicke confinement in magic-wavelength optical traps, in some cases realizing shift cancellation at the ten parts per billion level. Theory and empirical measurements can be used at varying levels of precision to determine the magic wavelength where shift cancellation occurs. However, lasers exhibit background spectra from amplified spontaneous emission or other lasing modes which can easily contaminate measurement of the magic wavelength and its reproducibility in other experiments or conditions. Indeed, residual light shifts from laser background have plagued optical lattice clock measurements for years. In this work, we develop a simple theoretical model allowing prediction of light shifts from measured background spectra. We demonstrate good agreement between this model and measurements of the background light shift from an amplified diode laser in an Yb optical lattice clock. Additionally, we model and experimentally characterize the filtering effect of a volume Bragg grating bandpass filter, demonstrating that application of the filter can reduce background light shifts from amplified spontaneous emission well below the 10 −18 fractional clock frequency level. This demonstration is corroborated by direct clock comparisons between a filtered amplified diode laser and a filtered titanium:sapphire laser.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterization and suppression of background light shifts in an optical lattice clock

Fasano

Chen

McGrew

et al. 2021

Preprint

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“…Among these, optical amplifiers have drawn great attention in recent years due to their numerous hybrid and integrated applications in optical networks 2 , silicon photonics 3 , all-optical switching 4 , and signal processing 5,6 , playing significant roles as amplifiers (preamplifiers, in-line amplifiers, and power boosters) 7–9 , wavelength converters 10–12 , modulators 13,14 , and all-optical logic gates 15 . Different types of optical amplifiers including solid-state 16 , doped fiber 17–19 , tapered 20 , Raman 21,22 , parametric 23–26 , and semiconductor optical amplifiers (SOAs) 27–31 have been investigated for various output optical spectra.…”

Section: Introductionmentioning

confidence: 99%

Ultra-broadband Optical Gain Engineering in Solution-processed QD-SOA Based on Superimposed Quantum Structure

Yousefabad

Matloub

Rostami

2019

Sci Rep

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In this work, the optical gain engineering of an ultra-broadband InGaAs/AlAs solution-processed quantum dot (QD) semiconductor optical amplifier using superimposed quantum structure is investigated. The basic unit in the proposed structure (QDs) is designed and fabricated using solution-processed methods with considerable cost-effectiveness, fabrication ease, and QDs size tunability up to various limits (0.1 nm up to the desired values), considering suitable synthesis methods. Increasing the number of QDs, the device can span more than 1.02 μm (O, C, S, and L bands) using only one type of material for all QDs, and is not restricted to this limit in case of using more QD groups. Also, it can manipulate the optical gain peak value, spectral coverage, and resonant energy for customized optical windows, among which 1.31 μm and 1.55 μm are simulated as widely-applicable cases for model validation. This makes the device a prominent candidate for ultra-wide-bandwidth and also customized-gain applications in general. Variation impact of homogeneous and inhomogeneous broadenings, injection current and number of QD groups on optical gain are explained in detail. Besides proposing a design procedure for implementation of an ultra-broadband optical gain using superimposed QDs in solution-processed technology, the proposed gain engineering idea using this technology provides practically infinite bandwidth and an easy way to realize. By introducing this idea, one more step is actually taken to approach the effectiveness of solution process technology.

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Characterization and Suppression of Background Light Shifts in an Optical Lattice Clock

et al. 2021

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Characterization and optimization of a tapered amplifier by its spectra through a long multi-pass rubidium absorption cell

Cited by 4 publications

References 19 publications

Characterization and suppression of background light shifts in an optical lattice clock

Characterization and suppression of background light shifts in an optical lattice clock

Ultra-broadband Optical Gain Engineering in Solution-processed QD-SOA Based on Superimposed Quantum Structure

Characterization and Suppression of Background Light Shifts in an Optical Lattice Clock

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